From: Guus Sliepen <guus@tinc-vpn.org>
Date: Sun, 16 Jan 2022 19:45:41 +0000 (+0100)
Subject: Fix potential crash during failing PMTU discovery.
X-Git-Url: https://tinc-vpn.org/git/browse?a=commitdiff_plain;ds=sidebyside;h=0912276c6467aa3ee6f570b31245367319da572a;hp=0912276c6467aa3ee6f570b31245367319da572a;p=tinc

Fix potential crash during failing PMTU discovery.

If we get PACKET_TOO_BIG responses when sending UDP packets, we lower the
maximum MTU we will probe accordingly. However, after enough of those
responses, maxmtu could drop below zero and wrap. Guard against that by
never dropping maxmtu below the minimum required MTU for UDP communication.
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